Stand Clear of Closing Doors, and That Love Seat
via Witold Riedel

I've lugged my fair share of large odds and ends on public transportation, and I've seen other people with all kinds of weird stuff. Just a few months ago I managed to single-handedly get my new vacuum cleaner with all its attachments through (well, over, really) the BART turnstiles in only one try, without breaking anything.
but I've never tried a couch or a sousaphone.